Two genes are said to be paralogous if they are derived from a duplication
event, but orthologous if they are derived from a speciation event. This is
how the above terms are used, at least, in an evolutionary context.
Cheers
Sophia
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Sophia Kossida
Merton College
Oxford OX1 4JD
England
e-mail: sophia.kossida@merton.oxford.ac.uk
tel : (44) (0) 1865 271263
fax : (44) (0) 1865 310447
URL : http://users.ox.ac.uk/~mert0223
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